**Core Concept**
The mass approach is a strategy in pharmacology that involves administering a fixed dose of a medication to a population, regardless of the individual's weight or body mass. This approach is often used for medications that have a narrow therapeutic index and are administered in a fixed dose, such as oral anticoagulants.

**Why the Correct Answer is Right**
The correct answer is based on the principle of pharmacokinetics, where the dose of a medication is directly proportional to the body weight. However, in the mass approach, the dose is fixed, regardless of the individual's weight. This approach is often used for medications that have a narrow therapeutic index, such as warfarin, which requires careful dosing to avoid toxicity. The mass approach takes into account the average weight of the population, but does not account for individual variations in weight or body mass.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mass approach. The mass approach is a fixed dose strategy, regardless of the individual's weight.
**Option B:** This option is incorrect because it is a characteristic of the weight-based approach, not the mass approach. In the weight-based approach, the dose is directly proportional to the individual's weight.
**Option C:** This option is incorrect because it is a characteristic of the dose titration approach, not the mass approach. In the dose titration approach, the dose is adjusted based on the individual's response to the medication.

**Clinical Pearl / High-Yield Fact**
The mass approach is often used for medications that have a narrow therapeutic index, such as oral anticoagulants. It is essential to carefully evaluate the patient's weight and body mass before initiating therapy with these medications.

**Correct Answer: D.**